#!/bin/bash

# Not sure what the right default is here: trying nonzero.
scala_exit_status=127
saved_stty=""

# restore stty settings (echo in particular)
function restoreSttySettings() {
  if [[ -n $SCALA_RUNNER_DEBUG ]]; then
    echo "restoring stty: $saved_stty"
  fi
  stty $saved_stty
  saved_stty=""
}

function onExit() {
  if [[ "$saved_stty" != "" ]]; then
    restoreSttySettings
  fi
  exit $scala_exit_status
}

# to reenable echo if we are interrupted before completing.
trap onExit INT

# save terminal settings
saved_stty=$(stty -g 2>/dev/null)
# clear on error so we don't later try to restore them
if [[ ! $? ]]; then
  saved_stty=""
fi
if [[ -n $SCALA_RUNNER_DEBUG ]]; then
  echo "saved stty: $saved_stty"
fi

# Finding the root folder for this Scala distribution
SOURCE=$0;
SCRIPT=`basename "$SOURCE"`;
while [ -h "$SOURCE" ]; do
    SCRIPT=`basename "$SOURCE"`;
    LOOKUP=`ls -ld "$SOURCE"`;
    TARGET=`expr "$LOOKUP" : '.*-> \(.*\)$'`;
    if expr "${TARGET:-.}/" : '/.*/$' > /dev/null; then
        SOURCE=${TARGET:-.};
    else
        SOURCE=`dirname "$SOURCE"`/${TARGET:-.};
    fi;
done;

# see #2092
SCALA_HOME=`dirname "$SOURCE"`
SCALA_HOME=`cd "$SCALA_HOME"; pwd -P`

# Constructing the extension classpath
TOOL_CLASSPATH=""
if [ -z "$TOOL_CLASSPATH" ] ; then
    for ext in "$SCALA_HOME"/lib/* ; do
        if [ -z "$TOOL_CLASSPATH" ] ; then
            TOOL_CLASSPATH="$ext"
        else
            TOOL_CLASSPATH="$TOOL_CLASSPATH:$ext"
        fi
    done
fi

[ -n "$JAVA_OPTS" ] || JAVA_OPTS="-Xmx256M -Xms32M"

# break out -D and -J options and add them to JAVA_OPTS as well
# so they reach the underlying JVM in time to do some good.  The
# -D options will be available as system properties.
declare -a java_args
declare -a scala_args

# default to the boot classpath for speed.
CPSELECT="-Xbootclasspath/a:"

while [ $# -gt 0 ]; do
  case "$1" in
    -D*)
      # pass to scala as well: otherwise we lose it sometimes when we
      # need it, e.g. communicating with a server compiler.
      java_args=("${java_args[@]}" "$1")
      scala_args=("${scala_args[@]}" "$1")
      shift
      ;;
    -J*)
      # as with -D, pass to scala even though it will almost
      # never be used.
      java_args=("${java_args[@]}" "${1:2}")
      scala_args=("${scala_args[@]}" "$1")
      shift
      ;;
    -toolcp)
      TOOL_CLASSPATH="$TOOL_CLASSPATH:$2"
      shift 2
      ;;
    -nobootcp)
      CPSELECT="-classpath "
      shift
      ;;
    *)
      scala_args=("${scala_args[@]}" "$1")
      shift
      ;;
  esac
done

# reset "$@" to the remaining args
set -- "${scala_args[@]}"

if [ -z "$JAVACMD" -a -n "$JAVA_HOME" -a -x "$JAVA_HOME/bin/java" ]; then
    JAVACMD="$JAVA_HOME/bin/java"
fi

"${JAVACMD:=java}" \
  $JAVA_OPTS \
  "${java_args[@]}" \
  ${CPSELECT}${TOOL_CLASSPATH} \
  -Dscala.usejavacp=true \
  -Dscala.home="$SCALA_HOME" \
  -Denv.emacs="$EMACS" \
   scala.tools.nsc.Main  "$1"

# record the exit status lest it be overwritten:
# then reenable echo and propagate the code.
scala_exit_status=$?
onExit
